改性氢氧化镁的制备及在HDPE中的应用  

Preparation of Modified Magnesium Hydroxide and Its Application in HDPE

作　　者：曹笑宁 马亚丽 岳岩 邓晓阳 衣思敏 刘伟强 李雪[1] CAO Xiao-ning;MA Ya-li;YUE Yan;DENG Xiao-yang;YI Si-min;LIU Wei-qiang;LI Xue(School of Chemical Engineering,Shenyang University of Chemical Technology,Shenyang 110020,China)

机构地区：[1]沈阳化工大学化工学院,辽宁沈阳110020

出　　处：《塑料工业》2022年第1期38-43,共6页China Plastics Industry

基　　金：辽宁省自然科学基金(L2015020609)。

摘　　要：以低品位菱镁矿为原料,γ-(甲基丙烯酰氧)丙基三甲氧基硅烷(KH570)为改性剂,通过蒸氨-沉镁改性-水热过程制备改性氢氧化镁[KH570-Mg(OH)_(2)],改性剂在Mg(OH)_(2)生成体系中加入。采用吸油值、活化指数、红外光谱(FTIR)、X射线衍射(XRD)等手段对改性结果进行表征,在改性时间为60min,改性剂用量为2%,并进行水热处理工艺制备的Mg(OH)_(2)改性效果最好,改性后Mg(OH)_(2)活化指数达到了98.75%,吸油值为53.05 mL/100g,接触角为149°。整个工艺连续且可循环,为制备疏水性Mg(OH)_(2)工业生产提供实验基础。并将改性前后的Mg(OH)2应用于高密度聚乙烯(HDPE),测试其阻燃和力学性能,结果表明,KH570-Mg(OH)_(2)添加量为40%时,HDPE/KH570-Mg(OH)_(2)复合材料的氧指数为29.5%,达到阻燃级别,拉伸强度为18.40 MPa,断裂伸长率为217.11%,验证了改性后的Mg(OH)2与HDPE有较好的相容性。Taking low-grade magnesite as raw material and silane coupling agent(KH-570)as modifier,modified magnesium hydroxide was prepared through the ammonia distillation-precipitation modification-hydrothermal process,and modifier was added during the Mg(OH)_(2) generation process.The modification results were characterized by oil absorption value,activation index,Fourier transform infrared spectroscopy(FTIR),X-ray diffraction(XRD)and other methods.When modification time is 60 min and modifier dosage is 2%,the modification effect of Mg(OH)_(2) prepared by the hydrothermal treatment process is the best.After modification,the activation index of Mg(OH)_(2) could reach 98.75%,the oil absorption value is 53.05 mL/100g,and the contact angle is 149°.The whole process is continuous and recyclable,providing an experimental basis for industrial production.The Mg(OH)_(2) before and after the modification were applied to high-density polyethylene(HDPE)to test its flame retardant and mechanical properties.The results show when the addition amount of Mg(OH)_(2) is 40%,the oxygen indexof HDPE/KH570-Mg(OH)_(2) composite material could reach 29.5%,which could achieve inflaming retarding level.The tensile strength is 18.40 MPa,and the elongation at break is 217.11%,which verifies that the modified Mg(OH)_(2) has good compatibility with HDPE.

关 键 词：氢氧化镁 表面改性 γ-(甲基丙烯酰氧)丙基三甲氧基硅烷 线型高密度聚乙烯 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]